Hi 6inarow.
As I said, I'm thinking through the same problem. Here's some of my research.
Here's a pic of a 53 car with the body off. You'll note: one rear tranny mount, two high side mounts.
The picture gives good perspective on why the dual bellhousing-mount setup is tough on a 53.
There's no crossmember there and there's not much room for putting one in. The left side looks like the biggest problem.
I don't know how representative this is for your 52. Does this mount tower look like yours?
My understanding is that the
high side mount bolts to the block on an inverted scalene triangle like the one below:
(ignore text, see left)
And we want to bolt the upright equilateral triangle type mount shown below to the 52-54 mount tower:
So, if our situations are similar, the question is whether or not the 52-54 sidemounts are in the same spatial location on the block as the 55-62.
If they are, then it should be cake to fab a plate with the late upright triangle bolt pattern and weld the "tophat" half of the old mount to it.
BUT, even if they line up front to back we're still not out of the woods.
If they are higher up on the block, the engine sits lower between the rails and the oilpan hits the center steering link. Lower down on the block and the engine sits up too high.
I guess the right way to do it is lift the engine into the frame, connect everything up to the driveline, mount the tranny, put the engine where you want it and then see whether the mounts need to be lengthened, shortened, or offset front to back...
But somebody MUST have done this already! In fact lots of people must have done this LOTS of times. There must be some knowledge out there. I'm actually surprised there isn't a downloadable pdf template that you can just print out and transfer to steel...